It is difficult to take medications during pregnancy. Hence, it is very important to find the cause of headaches. If you are 13 weeks pregnant and are having a real bad headache then you must immediately get your blood pressure checked. High blood pressure can cause persisting severe headache.
Other causes may not be related to pregnancy and include: Sinusitis, refractive errors of the eye, migraine, cluster headaches, brain tumors and aneurysms, high blood pressure, tension headaches, temporal arteritis, pinched cervical spinal nerve, TMJ, poor or disturbed sleep etc. Dental pain and ear ache due to infection or impacted wax can cause similar symptoms.
Do discuss this with your doctor and get yourself examined. Meanwhile you good get a good head massage and see if it helps. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
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